cfe_console.c revision 228631 
1/*-
2 * Copyright (c) 2007 Bruce M. Simpson.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27#include <sys/cdefs.h>
28__FBSDID("$FreeBSD: head/sys/dev/cfe/cfe_console.c 228631 2011-12-17 15:08:43Z avg $");
29
30#include <sys/param.h>
31#include <sys/kdb.h>
32#include <sys/kernel.h>
33#include <sys/priv.h>
34#include <sys/systm.h>
35#include <sys/types.h>
36#include <sys/conf.h>
37#include <sys/cons.h>
38#include <sys/consio.h>
39#include <sys/tty.h>
40
41#include <dev/cfe/cfe_api.h>
42#include <dev/cfe/cfe_error.h>
43
44#include <ddb/ddb.h>
45
46#ifndef	CFECONS_POLL_HZ
47#define	CFECONS_POLL_HZ	4
48#endif
49#define CFEBURSTLEN	128	/* max number of bytes to write in one chunk */
50
51static tsw_open_t cfe_tty_open;
52static tsw_close_t cfe_tty_close;
53static tsw_outwakeup_t cfe_tty_outwakeup;
54
55static struct ttydevsw cfe_ttydevsw = {
56	.tsw_flags	= TF_NOPREFIX,
57	.tsw_open	= cfe_tty_open,
58	.tsw_close	= cfe_tty_close,
59	.tsw_outwakeup	= cfe_tty_outwakeup,
60};
61
62static int			conhandle = -1;
63/* XXX does cfe have to poll? */
64static int			polltime;
65static struct callout_handle	cfe_timeouthandle
66    = CALLOUT_HANDLE_INITIALIZER(&cfe_timeouthandle);
67
68#if defined(KDB)
69static int			alt_break_state;
70#endif
71
72static void	cfe_timeout(void *);
73
74static cn_probe_t	cfe_cnprobe;
75static cn_init_t	cfe_cninit;
76static cn_term_t	cfe_cnterm;
77static cn_getc_t	cfe_cngetc;
78static cn_putc_t	cfe_cnputc;
79static cn_grab_t	cfe_cngrab;
80static cn_ungrab_t	cfe_cnungrab;
81
82CONSOLE_DRIVER(cfe);
83
84static void
85cn_drvinit(void *unused)
86{
87	struct tty *tp;
88
89	if (cfe_consdev.cn_pri != CN_DEAD &&
90	    cfe_consdev.cn_name[0] != '\0') {
91		tp = tty_alloc(&cfe_ttydevsw, NULL);
92		tty_makedev(tp, NULL, "cfecons");
93	}
94}
95
96static int
97cfe_tty_open(struct tty *tp)
98{
99	polltime = hz / CFECONS_POLL_HZ;
100	if (polltime < 1)
101		polltime = 1;
102	cfe_timeouthandle = timeout(cfe_timeout, tp, polltime);
103
104	return (0);
105}
106
107static void
108cfe_tty_close(struct tty *tp)
109{
110
111	/* XXX Should be replaced with callout_stop(9) */
112	untimeout(cfe_timeout, tp, cfe_timeouthandle);
113}
114
115static void
116cfe_tty_outwakeup(struct tty *tp)
117{
118	int len, written, rc;
119	u_char buf[CFEBURSTLEN];
120
121	for (;;) {
122		len = ttydisc_getc(tp, buf, sizeof buf);
123		if (len == 0)
124			break;
125
126		written = 0;
127		while (written < len) {
128			rc = cfe_write(conhandle, &buf[written], len - written);
129			if (rc < 0)
130				break;
131			written += rc;
132		}
133	}
134}
135
136static void
137cfe_timeout(void *v)
138{
139	struct	tty *tp;
140	int 	c;
141
142	tp = (struct tty *)v;
143
144	tty_lock(tp);
145	while ((c = cfe_cngetc(NULL)) != -1)
146		ttydisc_rint(tp, c, 0);
147	ttydisc_rint_done(tp);
148	tty_unlock(tp);
149
150	cfe_timeouthandle = timeout(cfe_timeout, tp, polltime);
151}
152
153static void
154cfe_cnprobe(struct consdev *cp)
155{
156
157	conhandle = cfe_getstdhandle(CFE_STDHANDLE_CONSOLE);
158	if (conhandle < 0) {
159		cp->cn_pri = CN_DEAD;
160		return;
161	}
162
163	/* XXX */
164	if (bootverbose) {
165		char *bootmsg = "Using CFE firmware console.\n";
166		int i;
167
168		for (i = 0; i < strlen(bootmsg); i++)
169			cfe_cnputc(cp, bootmsg[i]);
170	}
171
172	cp->cn_pri = CN_LOW;
173}
174
175static void
176cfe_cninit(struct consdev *cp)
177{
178
179	strcpy(cp->cn_name, "cfecons");
180}
181
182static void
183cfe_cnterm(struct consdev *cp)
184{
185
186}
187
188static void
189cfe_cngrab(struct consdev *cp)
190{
191
192}
193
194static void
195cfe_cnungrab(struct consdev *cp)
196{
197
198}
199
200static int
201cfe_cngetc(struct consdev *cp)
202{
203	unsigned char ch;
204
205	if (cfe_read(conhandle, &ch, 1) == 1) {
206#if defined(KDB)
207		kdb_alt_break(ch, &alt_break_state);
208#endif
209		return (ch);
210	}
211
212	return (-1);
213}
214
215static void
216cfe_cnputc(struct consdev *cp, int c)
217{
218	char cbuf;
219
220	if (c == '\n')
221		cfe_cnputc(cp, '\r');
222
223	cbuf = c;
224	while (cfe_write(conhandle, &cbuf, 1) == 0)
225		continue;
226}
227
228SYSINIT(cndev, SI_SUB_CONFIGURE, SI_ORDER_MIDDLE, cn_drvinit, NULL);
229